16．--What's this？--It's ___________z．（　�。�
A．aB．anC．不填

分析 -這是什么？
-它是一個(gè)"z"．

解答 答案：A
a和an是不定冠詞，表示泛指的一，一個(gè)，a用于以輔音音素開(kāi)頭的單詞或字母前，an用于以元音音素開(kāi)頭的單詞或字母前．此處的z發(fā)音為zi：，以輔音音素開(kāi)頭，且由this可知，答語(yǔ)意思應(yīng)該是它是一個(gè)z，所以選A．

點(diǎn)評(píng) 此題要了解a和an的區(qū)別，并結(jié)合題干和選項(xiàng)選擇正確的答案．

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